Burroughs and henry solomon wellcome



(No Model.)

S. R. SLATER. HYPODERMIG SYRINGB.

No. 486,05*?. Patented Nov. 8, 1892.

UNITED STATES PATENT OEEICE.

MAINEVILLE BURROUGHS AND HENRY SOLOMON SAME PLACE.

W'ELLOOME, OF

HYPODERMIC SYRINGE.

SPECIFICATION forming part of Letters Patent No. 486,057, dated November8, 1892.

Application filed June 8, 1892. Serial No. 435,990- (No model.)

T0 all whom t may concern:

Be it known thatI, STANLEY READ SLA'rER, a subject of Her Majesty theQueen of Great Britain, residing at Clapton, London, in the county ofMiddlesex, England, have invented a certain new and useful ImprovedHypodermic Syringe, of which the following is a speciiication.

My invention relates to an improved hypodermie syringe, the object ofsame being to provide means for the protection of the graduated glassbody, such means enabling, also, the needle and cap to be readilyattixed to the body of the instrument, and also to construct the pistonand connected parts in such a manner that they may be readily adjustedand removed for cleaning purposes.

My invention is illustrated in the accompanying drawings, in which-Figure lis an elevation of my improved syringe. Fig. 2 is a longitudinalsection of same. Fig. 3 is a cross-section taken on the line fr x, Fig.2, and Fig. 4 is asimilar section taken on the line y y, Fig. 2.

The syringe is provided with the usual graduated glass body a, and overthis I place a light metal casing b,havinga cutaway face and back, asshown, so as to expose the glass body and its contents, or one face onlymay be out away, or the casing may be made open in parts otherwise thanas shown in the drawings. This casing aords a protection to the glassbody a, and also, as will be seen by reason of its tapered end or nozzlec, affords a means of aflixing the usual cap d and needle e, Which areslipped upon the saine instead of, as usual, upon the tapered end of theglass body. In place of this tapered end I make the glass body with ablunt or cut-oit' end, as shown, and place around the contraction ofsame a rubber or like ring or washer-f, which prevents the glass frommoving about in the casing. The glass is retained in the casing bymeansof a cap g, which is screwed onto this latter. The cap g has a passagethrough same, through which passes the tubular piston-rod 7L, saidpiston-rod carrying a rubber or other piston 'L' and a rod j, having acap l. This rod j must be prevented from turning in the piston h, and toaccomplish this I prefer to remove a portion of the metal of the rod j,so as to form a flat face, as clearly shown in Figs. 2, 3,and l,and topinch up the tubular piston h at the point h', as shown, so that whilecapable of sliding therein the rod is not able to turn. The other end otthe rod is screwed and carries a nutkandatits extreme end a suitablehandle m. The nut 7o abuts against the piston h, and it will be seenthat by turning same the rod j will be raised or lowered and the pistoni be consequently compressed or released, so` that its tightness in theglass body may be regulated.

By unscrewing the cap g the piston and rods may be removed, and byremoving the nut 7c and handle m the rodj may be removed from the piston7L for cleaning or other purposes.

What I claim is l. A syringe comprising a protectingecasing having acut-away portion, a nozzle and retaining-cap secu red to the casin g, aglass body titting the casing, having a reduced end, and a Washerinterposed between the reduced end of the body and casing, substantiallyas described.

2. A syringe comprising a protecting-casing having cut-away portions, anozzle and retaining-cap connected to the casing, a glass body {ittingthe casing, a tubular pistonu'od having a contracted portion andcarrying a compressible piston, a screw-rod sliding in said piston andhaving a flattened face corresponding to the contracted portion of thepiston-rod, a cap, and an adjusting nut and handle, substantially asdescribed.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

STANLEY READ SLATER.

Witnesses:

ALLEN PARRY JONES, JAMES BoLEs.

